Q: 49 (CDS-I/2016)

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A person rings a metallic bell near a strong concrete wall. He hears the echo after 0.
3.s. If the sound moves with a speed of 340 m/s, how far is the wall from him?
question_subject: 
Science
question_year: 
2016
question_exam: 
CDS-I
stats: 
0,16,128,40,40,48,16